Map n = Sum c_i 10^i to a(n) = Sum c_i 5^i.

Terms

a(0) =0a(1) =1a(2) =2a(3) =3a(4) =4a(5) =5a(6) =6a(7) =7a(8) =8a(9) =9a(10) =5a(11) =6a(12) =7a(13) =8a(14) =9a(15) =10a(16) =11a(17) =12a(18) =13a(19) =14a(20) =10a(21) =11a(22) =12a(23) =13a(24) =14a(25) =15a(26) =16a(27) =17a(28) =18a(29) =19